Chain line/run.....What's it mean????

JAKBLADE
JAKBLADE Posts: 336
edited April 2010 in MTB workshop & tech
When people talk about bottom brackets/front chainrings etc. and they say "Ensure your chain run/line is correct ie.50mm" What is this measurement and where is it taken from/too????
Project Finished....On-one Inbred..
Specialized Hardrock A1 Comp FS(1999-2000)
Carrera Subway 2 (for work)
Hoffman BMX (please don't hold this one against me!!)

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